The annual Greening the Blue Report – The UN system’s environmental footprint and efforts to reduce it shows the progress both at the UN system-wide level and entity level of implementing the Strategy for Sustainability Management in the United Nations System 2020-2030, Phase I: Environmental Sustainability in the Area of Management (Sustainability Strategy I). The 2023 edition of the Greening the Blue Report, which provides 2022 data, was published on 21 December 2023. Commenting on the results from the report, António Guterres, UN Secretary-General noted, “The world must work together to address the triple planetary crisis of runaway climate change, biodiversity loss, and pollution. We at the United Nations must do our part with advocacy and action. I encourage all UN entities to set an example by greening the blue.” Sustainability Strategy I covers both environmental impact areas and management functions. Highlights of the Greening the Blue Report 2023’s UN system-wide 2022 data results include: Environmental Impact Areas Greenhouse gas emissions (GHG) - the UN’s operations and facilities emitted 1.4 million tonnes of CO2eq in total or 4.6 tonnes CO2eq per capita. The UN system’s GHG emissions by source were 38% from air travel, 47% from facilities and 15% from other forms of travel Waste - the average waste generated for the whole UN system was 321 kg/person Water - the average water consumption by the UN system was 49 m3 per UN personnel per year Management Functions Environmental Governance – 7 UN entities have met or exceeded the criteria for implementing an Environmental Management System, with an additional 15 entities approaching the criteria Procurement* – 24 out of 29 organizations implemented formal sustainable procurement policies in their procurement processes Human Resources – 31 entities have environmental training available for their staff Greening the Blue Report 2023 highlights the environmental impacts of over 308,000 personnel in 57 entities across Headquarters, field offices and operations on the ground. The report also includes a case study from a UN entity on each of the environmental impact areas and management functions. To read the whole report and the detailed entity level data, please visit greeningtheblue.org. *Procurement data is taken from the 2022 Annual Statistical Report on United Nations Procurement. More information Methodologies and data collection used, please visit greeningtheblue.org/methodology. Methodology related to travel emissions provided by the International Civil Aviation Organisation please visit the ICAO website. For climate neutrality, please visit the UNFCCC website. For more information, please contact: UN Environment Programme E-mail: unepnewsdesk@unep.org
Governments are shifting from voluntary measures to regulated mandates as escalating heat and carbon commitments reshape sustainable construction worldwide. The UK’s new National Heat Risk Commission signals that sustainable building design must now integrate overheating resilience as a measurable criterion of environmental sustainability in construction. Global policy trends reinforce this shift, with UN-backed frameworks promoting passive-first, low carbon building strategies across climate-stressed regions.
The Future Homes Hub’s Embodied Carbon and Resource Efficiency Board underscores how embodied carbon and resource efficiency are redefining compliance. Whole life carbon assessment, lifecycle assessment and environmental product declarations (EPDs) are becoming the baseline for sustainable building practices, linking design decisions directly to life cycle cost and long-term performance. The carbon footprint of construction is no longer a theoretical concern but a regulated metric influencing tenders, specifications and procurement standards.
Manufacturers are responding by prioritising low embodied carbon materials and renewable building materials within circular economy strategies. Products supported by verified data on embodied carbon in materials are emerging as preferred options for specifiers pursuing net zero whole life carbon outcomes. Bio-based solutions such as wood fibre insulation now exemplify eco-design for buildings, combining thermal performance with low carbon design that supports energy-efficient buildings and net zero carbon targets.
Across the sector, sustainable material specification and resource efficiency in construction are converging into measurable frameworks aligned with BREEAM and BREEAM v7 standards. These support decarbonising the built environment through circular construction strategies, end-of-life reuse in construction and green building products designed for longer lifecycle performance.
The direction is clear: policy, market and climate conditions are embedding whole life carbon thinking into every stage of sustainable construction. Those leading with verifiable data, sustainable design principles and circular economy in construction models will define the next generation of low-impact, carbon neutral construction aligned with global sustainability goals.
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